Printing to a file is broken with Linux content sandboxing enabled
While investigating legacy/trac#23016 (moved) it turned out that the newly enabled content sandboxing prevents from printing to a file not only on particular Linux setups but outright denies it.
The reason for that is https://bugzilla.mozilla.org/show_bug.cgi?id=1309205. We need to backport
to fix that. As a workaround one can set